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pH and Its Importance in Textile Coloration
Author(s) -
Dawson T. L.
Publication year - 1981
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1981.tb03574.x
Subject(s) - textile , alkalinity , dyeing , polyester , polyamide , chemistry , chemical engineering , cellulosic ethanol , polymer science , pulp and paper industry , organic chemistry , materials science , cellulose , composite material , engineering
The use of the pH scale is commonplace throughout the textile processing industry. This paper outlines a simplified theoretical basis for the system and how pH calculations can be made in any neutralisation system (including buffer mixtures) involving weak or strong acids and bases. Methods of measuring and con trolling pH both in the laboratory and in bulk scale processing are described. The influence and relative importance of the need for control of dye–liquor pH conditions is illustrated principally for reactive dyes on cellulosic and reactive and acid dyes on polyamide fibres – i. e., those fibres where the pH greatly influences the uptake of dye. Fibres (polyester and acrylics), where the pH more particularly influences the chemical stability of the dyes in the dyebath rather than the rate of dyeing, are also discussed. Factors affecting the stability of the finished dyeings to various conditions of acidity or alkalinity are described.